Unknown and Undrinkable? India drinks what it does not measure: why a clean record is not the same as clean water, and how a sampling rule scaled to its people would show what pesticides are in its rivers, wells and taps

Is there pesticide in the water India drinks? And how would anyone know? India's rules answer the second question with a design that cannot answer the first. The national drinking-water standard sets limits for 18 pesticides and no testing frequency. The Jal Jeevan Mission tests sources for chemicals once a year and leaves pesticides to state laboratories. The river network samples pesticides once a year, before the monsoon, and in 2020 produced pesticide data for at most 114 stations, one for every 12.3 million people. The European Union, by contrast, requires at least 88 pesticide samples a year for a supply zone serving 10 million people, and the United States samples every entry point to a water system and moves to quarterly testing wherever a pesticide is found. India tests bottled water for pesticides twice a year; we found no rule requiring any tap, well or hand pump to be tested at all. Where independent scientists did look, they found α-endosulfan at 58 µg/L in Kasaragod wells, about 145 times India's limit, and imidacloprid at 63.33 µg/L in the Teesta, a compound for which India sets no limit. The gap is widening: the United States now regulates two PFAS at four parts per trillion, and India's standards contain no PFAS parameter. These gaps fall on the same households, those that cannot buy their water, live far from a state laboratory and drink from sources beside the fields, and they reproduce themselves, because a source that is never tested never records the exceedance that would justify testing it. The paper recommends a sampling rule: test every drinking-water source at least twice a year, scale testing to the people served, raise it on detection, follow use, and publish every result with its detection limit. A clean record is not the same as clean water.